Everyday there are cars from local San Diego car clubs exhibited at the northern courtyard and entry gate
http://www.sdfair.com/fair/index.php?fuseaction=events.car_shows
In the Surfside Race Place (a 30 second walk North of the car show at the North courtyard, and inside... lots of monitors showing horce racing at other venues)
Wednesday June 13 thru June 24, American Legends cars from chain drive carriages to supercars
Tuesday June 26 to Wednesday July 4, collector cars, hot rods, customs, and the Batmobile
And in the Chevrolet Arena there will be various motorsports like Monster trucks (enjoyable, especially when they do donuts) motocross, and the tough truck competition
http://www.sdfair.com/fair/index.php?fuseaction=concerts.arena